Glass manufacturing – Processes – Forming product or preform from molten glass
Patent
1981-09-16
1983-05-17
Fisher, Richard V.
Glass manufacturing
Processes
Forming product or preform from molten glass
65 12, 65 13, C03B 37025
Patent
active
043838430
ABSTRACT:
Apparatus for heating a vertically suspended preform from which lightguide fiber is drawn includes a torch having a plurality of ducts that open to a surface adjacent to a lower end of the preform. Fuel and oxidizing gases flow from the ducts, mix at the surface and flame about a necked-down, lower portion of the preform to form a melt cone from which the fiber is drawn. The ducts and the preform are positioned to cause a combustion zone of each flame to impinge upon the preform. In a preferred embodiment, the openings of the ducts are arrayed in a circle which is referred to as a pitch circle and which has a diameter that is less than that of the preform. Also, the ducts are arranged so that the gases are directed at a predetermined angle to the axis of the preform.
REFERENCES:
patent: 2982991 (1961-05-01), Karlovitz
patent: 3125428 (1964-03-01), Maczka
patent: 3224840 (1965-12-01), Lefever
patent: 3652248 (1972-03-01), Loxley et al.
patent: 4154592 (1979-05-01), Bailey
patent: 4204852 (1980-05-01), Watts et al.
patent: 4231777 (1980-11-01), Lynch et al.
patent: 4249925 (1981-02-01), Kawashima et al.
patent: 4251250 (1981-02-01), Aulich et al.
Smithgall et al., "Drawing Lightguide Fiber," Western Electric Engineer, Winter 1980, vol. 24, No. 1, pp. 49-61.
Fisher Richard V.
Somers E. W.
Western Electric Company Inc.
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